Two coherent sources S 1 and S 2 having same phase, emit light of wavelength λ . The separation between S 1 and S 2 is 2 λ . The light of collected on a screen placed at a distance D > > λ from slit S 1 as shown in figure. Find the minimum distance so that the intensity at P is equal to intensity at O.
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
x 2 + D 2 + λ 2 –2 λ 
= 
4(x 2 + D 2 ) = (4D −3λ ) 2 
16 D 2
x 2 + D 2 = 4 D 2
x 2 = 3D 2
x = 
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